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 Equivalent isotropically radiated power(EIRP)

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PostSubject: Equivalent isotropically radiated power(EIRP)   Tue Jul 14, 2015 1:22 pm

Equivalent
isotropically radiated
power
In radio communication
systems, equivalent
isotropically radiated
power (EIRP) or,
alternatively, effective
isotropically radiated
power[1] is the
amount of power that
a theoretical isotropic
antenna (which evenly
distributes power in all
directions) would emit
to produce the peak
power density observed
in the direction of
maximum antenna gain.
EIRP can take into
account the losses in
transmission line and
connectors and includes
the gain of the antenna.
The EIRP is often
stated in terms of
decibels over a
reference power
emitted by an isotropic
radiator with an
equivalent signal
strength. The EIRP
allows comparisons
between different
emitters regardless of
type, size or form. From
the EIRP, and with
knowledge of a real
antenna's gain, it is
possible to calculate real
power and field
strength values.
where and (output
power of transmitter)
are in dBm, cable losses
( ) is in dB, and antenna
gain ( ) is expressed in
dBi, relative to a
(theoretical) isotropic
reference antenna.
This example uses
dBm, although it is also
common to see dBW.
Decibels are a
convenient way to
express the ratio
between two
quantities. dBm uses a
reference of 1 mW and
dBW uses a reference
of 1 W.
and
A transmission output
of 50 W is the same as
17 dBW or 47 dBm.
The EIRP is used to
estimate the service
area of the transmitter,
and to coordinate
transmitters on the
same frequency so that
their coverage areas do
not overlap.
In built-up areas,
regulations may restrict
the EIRP of a
transmitter to prevent
exposure of personnel
to high power
electromagnetic fields,
however EIRP is
normally restricted to
minimise interference
to services on similar
frequencies.
The Arecibo Planetary
Radar transmits up to 1
MW (60 dBW) of power
with an antenna gain of
about 73.3 dB at 12.6
cm wavelength,
resulting in an EIRP of
roughly 133 dBW (20
TW).
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PostSubject: Re: Equivalent isotropically radiated power(EIRP)   Tue Jul 14, 2015 7:45 pm

Razz like
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Equivalent isotropically radiated power(EIRP)
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